Package: nautilus Version: 43.2-1 There is a graphical glitch in the version of Nautilus used in Debian testing that causes the entire Nautilus window to become blank (gray) when switching tabs. This is an upstream issue and has been fixed in Nautilus 44, but not backported into 43.x.
See this upstream ticket for more information: https://gitlab.gnome.org/GNOME/nautilus/-/issues/2379